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Members of the Castellers "Vila de Gracia" start forming their famous human tower called "castell" in the Barcelona neighborhood of Gracia, Catalonia, Spain on Sunday May 19 2013. A "castell" is a human tower traditionally built during festivals in many places in Catalonia. At these festivals, several "colles" or teams compete to build the most impressive towers they can. (AP Photo/Emilio Morenatti)

Members of the Castellers of Barcelona join their hands to start making their "castell" or human tower in the Barcelona neighborhood of Gracia, Catalonia, Spain on Sunday May, 19 2013. A "castell" is a human tower traditionally built during festivals in many places in Catalonia. At these festivals, several "colles" or teams compete to build the most impressive towers they can. (AP Photo/Emilio Morenatti)

Members of the Castellers "Vila de Gracia" form their famous human tower called "castell" in the Barcelona neighborhood of Gracia, Catalonia, Spain on Sunday May 19, 2013. A "castell" is a human tower traditionally built during festivals in many places in Catalonia. At these festivals, several "colles" or teams compete to build the most impressive towers they can. (AP Photo/Emilio Morenatti)

Members of a Castellers form their famous human tower called "castell", as one of its members mounts the top, waving to the crowd in the Barcelona neighborhood of Gracia, Catalonia, Spain on Sunday May 19 2013. A "castell" is a human tower traditionally built during festivals in many places in Catalonia. At these festivals, several "colles" or teams, compete to build the most impressive towers they can. (AP Photo/Emilio Morenatti)

Members of the Castellers "Vila de Gracia" form their famous human tower called "castell" in the Barcelona neighborhood of Gracia, Catalonia, Spain on Sunday May 19 2013. A "castell" is a human tower traditionally built during festivals in many places in Catalonia. At these festivals, several "colles" or teams compete to build the most impressive towers they can. (AP Photo/Emilio Morenatti)

Members of the Castellers of Barcelona crowd together after the collapse of their "castell" or human tower in the Barcelona neighborhood of Gracia, Catalonia, Spain on Sunday May 19, 2013. A "castell" is a human tower traditionally built during festivals in many places in Catalonia. At these festivals, several "colles" or teams compete to build the most impressive towers they can. A few participants were slightly wounded after the collapse of the human tower and were evacuated to the hospital. (AP Photo/Emilio Morenatti)